Delay or cease operations if marine and freshwater mammals are detected within a specified zone
Overall effectiveness category No evidence found (no assessment)
Number of studies: 0
Background information and definitions
Activities that produce large amounts of underwater noise, such as seismic airgun surveys, pile driving, dredging, explosives and sonar, may disturb or cause auditory injury to marine and freshwater mammals (Gordon et al. 2003, Bailey et al. 2010). Delaying or ceasing such activities for a specified time if marine or freshwater mammals are detected within an ‘exclusion’ zone may help to reduce negative impacts and the risk of injury. This may involve using trained observers, acoustic monitoring and/or automated systems to detect mammals (Verfuss et al. 2018).
Bailey H., Senior B., Simmons D., Rusin J., Picken G. & Thompson P.M. (2010) Assessing underwater noise levels during pile-driving at an offshore windfarm and its potential effects on marine mammals. Marine Pollution Bulletin, 60, 888–897.
Gordon J., Gillespie D., Potter J., Frantzis A., Simmonds M.P., Swift R. & Thompson D. (2003) A review of the effects of seismic surveys on marine mammals. Marine Technology Society Journal, 37, 16–34.
Verfuss U.K., Gillespie D., Gordon J., Marques T.A., Miller B., Plunkett R., Theriault J.A., Tollit D.J., Zitterbart D.P., Hubert P. & Thomas L. (2018) Comparing methods suitable for monitoring marine mammals in low visibility conditions during seismic surveys. Marine Pollution Bulletin, 126, 1–18.